Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:10:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size(); i ++) { ^ user.cpp: In function ‘int main()’: user.cpp:32:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[i].size(); j ++) { ^